Attaching device



Nov. 29, 1938. H. R. ELLIS- ATTACHING DEVICE Filed Nov. l 9, 1937Patented Nov. 29, 1938 oriee 4 Claims.

This invention relates to an electrical plug, portion 3 substantially ofsemi-o'voidal contour more particularly to the male or plug section ofelectrical connections, and the invention has for its object to provide,in a manner as hereinafter set forth a plug of the type referred to,includin means for firmly attaching it to the support for an electricaloutlet or output used in dwellings, ofiices, etc, and with the plug soformed to quickly remove it from attaching position when desired.

The invention further aims to provide, in a manner as hereinafter setforth, a plug of the type referred to including means to constitute apair of independent suction chambers functioning to securely connect theplug in relation to a support for the female or socket section of suchconnection.

A further object of the invention is to provide, in a manner ashereinafter set forth, a plug of the type referred to including meansindependent of the prongs thereof for automatically securing it inattached relation with respect to the female section of an electricalconnection.

Further objects of the invention are to provide, in a manner ashereinafter set forth, an electrical plug for the purpose referred towhich is simple in its construction, strong, durable, thoroughlyefncient in use, conveniently applied in attaching position, andinexpensive to manufacture.

To the above ends essentially and to others which may hereinafterappear, the invention consists of the novel construction, combinationand arrangement of parts as will be more specifically referred to andillustrated in the accompanying drawing wherein is shown an embodimentof the invention, but it is to be understood that changes, variationsand modifications may be resorted to which fall within the scope of theinvention as claimed.

In the drawing wherein like reference characters denote correspondingparts throughout the several views:

Figure l is a perspective view of an electrical plug constructed inaccordance with this invention, and with the contact prongs thereofshown in dotted lines,

Figure 2 is a view of the plug partly in side elevation and partly invertical section, partly broken away, and

Figure 3 is an inverted plan of the plug.

With reference to Figures 1, 2 and 3, the plug generally indicated at lincludes a resilient onepiece body part formed of a substantially solidcentrally disposed head or inner portion 2 of circular cross sectionhaving a circular recess 2 at its inner end, and a carrier or hollowouter having an opening centrally of its outer end and an integralflange 4 which registers with said opening. The portion 3 iscompressible and eX- tendible relative to portion 2 when the device isto be attached to the support having the electrical outlet or output.

The carrier 3 includes a front wall 5, a rear wall 6, an outer end Imerging into the walls 5, 6, and a pair of rounded side walls 8, 9,merging into 10 the walls 5, 6. The flange 4 is formed on the end i. Theinner faces of the walls 5, l5, intermediate their ends merge intoopposite sides of the head 2. The walls '5, 6, are extended laterally inopposite directions with respect to the head 2. 15 The end I is integralwith the outer end of head 2. The walls 8, 9 are spaced from theopposite sides of the head 2 which are not integral with the walls 5, G.The portions of the walls 5, 6, which are not integral with the head 2,the sides of 20 the head 2 which are not integral with the walls 5, 6,and the walls 8, 9, coact to provide a pair of spaced independentsuction or vacuum chambers iii, ll of segmental contour, opening attheir inner ends at the inner end of the device and 25 which graduallyincrease in area from the outer to the inner end of the device. Tofacilitate the compressible and extendible action of the carrier 3 onthe application of the device, the latter is formed, at the transversecenter of its inner end, 30 with a pair of spaced aligned notches l2extending through the walls 5, 6, and the wall 2* of the circular recess2 The contact prongs of the device are indicated at l3, and whichproject from the base 2 of recess 2 to beyond the inner end of the head2.

When the plug i is employed, the prongs l3 of the plug are engaged inthe female section of the connection. The circuit connections I l extendthrough the opening in the end wall 1. After the plug is arranged in themanner as stated, the outer portion 3 of the device is compressedagainst the support for the female section and then released whereby thechambers 10, II will provide a suction action thereby creating a vacuumand detachably securing the plug to the support aforesaid therebypreventing the separation of the male section from the female section ofthe electrical connection until the vacuum is broken.

The body part in side elevation is semi-ovoidal in contour and ovalcontour in transverse sections. The front and rear walls of the carrierare of semi-ovoidal contour. The side walls of the carrier in crosssection are upon the segment of a circle. The outer end wall of thecarrier in lengthwise section is of arcuate contour.

What I claim is:

1. An electrical plug including a resilient onepiece body part formed ofa substantially solid centrally disposed head and a hollow carrierhaving an outer end, and front, rear, and side walls,

said walls including inner and outer faces, said side Walls merging intosaid front and rearwalls, a pair of opposed sides of said head merginginto the inner faces of the front and rear walls intermediate the endsof the latter, the side walls of the carrier being spaced from the otherpair of opposed sides of the head, said side walls in connection withthe said other pair of opposed sides of the head and the remainingportions of the said front, rear and outer end walls of the carrierproviding a pair of suction creating chambers closed at the outer endand opening at the inner end of said body part, said chambers beingspaced from each other by said head and providing for connecting saidbody part to a support for an electrical output at opposite sides of theoutput, said body part being of semi-ovoidal contour in side elevationand oval contour in transverse section.

2. An electrical plug including a resilient onepiece body part formed ofa substantially solid centrally disposed head and a hollow carrierhaving an outer end, and front, rear, and side walls, said wallsincluding inner and outer faces, said side walls merging into said frontand rear walls, a pair of opposed sides of said head merging into theinner faces of the front and rear walls intermediate the ends of thelatter, the side walls of the carrier being spaced from the other pairof opposed sides of the head, said side walls in connection with thesaid other pair of opposed sides of the head and the remaining portionsof the said front, rear and outer end walls of the carrier providing apair of suction creating chambers closed at the outer end and opening atthe inner end of said body part, said chambers being spaced from eachother by said head and providing for connecting said body part to asupport for an electrical output at opposite sides of the output, saidhead being formed with a recess in its inner end, said body part beingprovided at its inner end on its transverse median witha pair of spacedaligned notches extending through the inner ends of said front and rearwalls and the wall of said recess, circuit connections extending throughsaid outer end wall into said head, and contact prongs projecting fromthe base of said recess beyond the inner end of said body part.

3. An electrical plug including a resilient onepiece body part formed ofa substantially solid centrally disposed head and a hollow carrierhaving an outer end, and front, rear, and side walls, said wallsincluding inner and outer faces, said side walls merging into said frontand rear Walls, a pair of opposed sides of said head merging into theinner faces of the front and rear walls intermediate the ends of thelatter, the side walls of the carrier being spaced from the other pairof opposed sides of the head, said side Walls in connection with thesaid other pair of opposed sides of the head and the remaining portionsof the said front, rear and outer end walls of the carrier providing apair of suction creating chambers closed at the outer end and opening atthe inner end of said body part, said chambers being spaced fromeachother by said head and providing for connecting said body part to asupport for an electrical output at opposite sides of the output, saidhead being formed with a recess in its inner end, said body part beingprovided at its inner end on its transverse median with a pair of spacedaligned notches extending through the inner ends of said front and rearwalls and the wall of said recess, circuit connections extending throughsaid outer end wall into said head, and contact prongs projecting fromthe base of said recess beyond,

the inner end of said body part, said body part being of semi-ovoidalcontour in side elevation and oval contour in transverse section.

4. An electrical plug including a resilient onepiece body part formed ofa substantially solid centrally disposed head and a hollow carrierhaving an outer end, and front, rear, and side walls, said wallsincluding inner and outer faces, said side walls merging into said frontand rear walls,

closed at the outer end and opening at the inner l end of said bodypart, said chambers being spaced from each other by said head andproviding for connecting said body part to a support for an electricaloutput at opposite sides of the output,

said head being tapered and of circular cross section, said front andrear walls being of semiovoidal contour, said side walls in crosssection being upon the segment of a circle, and said outer end inlengthwise section being of arcuate contour.

HORACE R. ELLIS.

